Huawei E1731Cs-1 Airtel India detect and unlock procedure

Unlock procedure will work on E173Cs-1 Airtel India modems with these firmware versions:
21.157.31.00.284 (Build: Mar 17 2012 12:15:53)
21.157.13.00.284 (Build: Feb 16 2012 11:05:38)

Download firmware update

Extract archive and launch “DriverSetup.exe“.NOTE: Drivers must be downloaded from this link only. Unlock with other drivers installed will not work.

Click "Start".

Wizard will detect modem and ask for firmware code.

Launch DC-Unlocker client software.

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Open Server tab, enter your username and password that you received after credits purchase. Click "Check login". (you can buy credits here www.dc-unlocker.com/buy)
If DC-Unlocker/Vygis/Rocker/Infinity dongle is connected, do not enter username and password, only click "Check login".

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Select manufacturer: Huawei modems, model: Huawei E303, proceed to "Unlocking" tab.

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Select "Generate Firmware code by IMEI".
Enter IMEI number.

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Click "Do job" button.
Software will generate firmware code.

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Enter generated firmware code to firmware update wizard and click "OK" button.

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Wizard will start to update modem firmware. Do not disconnect modem or turn off computer – you can damage modem.

Wait till drivers fully install and this message below (Please wait..configuring software) disappear. After message disappears, restart computer (necessary step).

Remove SIM card from modem.

Wait till you see a message that modem is unlocked.

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Open Unlock tab, select “Read unlock code and auto enter to modem”.
Click “Do job”.

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Wait till you see a message that phone is unlocked.

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After you see that unlock is successful, restart modem.

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